2523661 has 8 divisors (see below), whose sum is σ = 2896704. Its totient is φ = 2153760.

The previous prime is 2523643. The next prime is 2523671. The reversal of 2523661 is 1663252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2523661 - 2⁷ = 2523533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2523641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1326 + ... + 2608.

It is an arithmetic number, because the mean of its divisors is an integer number (362088).

2^2523661 is an apocalyptic number.

It is an amenable number.

2523661 is a deficient number, since it is larger than the sum of its proper divisors (373043).

2523661 is a wasteful number, since it uses less digits than its factorization.

2523661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571.

The product of its digits is 2160, while the sum is 25.

The square root of 2523661 is about 1588.6034747538. The cubic root of 2523661 is about 136.1477093248.

The spelling of 2523661 in words is "two million, five hundred twenty-three thousand, six hundred sixty-one".